EP0249797A2 - Pressure-regulating valve - Google Patents

Pressure-regulating valve Download PDF

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Publication number
EP0249797A2
EP0249797A2 EP87107989A EP87107989A EP0249797A2 EP 0249797 A2 EP0249797 A2 EP 0249797A2 EP 87107989 A EP87107989 A EP 87107989A EP 87107989 A EP87107989 A EP 87107989A EP 0249797 A2 EP0249797 A2 EP 0249797A2
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EP
European Patent Office
Prior art keywords
pressure
channel
control valve
pressure control
pressure sensor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP87107989A
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German (de)
French (fr)
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EP0249797B1 (en
EP0249797A3 (en
Inventor
Volker Dr. Rösch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voss Automotive GmbH
Original Assignee
Armaturenfabrik Hermann Voss GmbH and Co
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Application filed by Armaturenfabrik Hermann Voss GmbH and Co filed Critical Armaturenfabrik Hermann Voss GmbH and Co
Publication of EP0249797A2 publication Critical patent/EP0249797A2/en
Publication of EP0249797A3 publication Critical patent/EP0249797A3/en
Application granted granted Critical
Publication of EP0249797B1 publication Critical patent/EP0249797B1/en
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Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/20—Control of fluid pressure characterised by the use of electric means
    • G05D16/2006—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means
    • G05D16/2013—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means
    • G05D16/2024—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means the throttling means being a multiple-way valve

Definitions

  • the invention relates to a pressure control valve, in particular an electro-pneumatic 3/2-way pressure control valve, consisting of a valve body with at least two input or output channels and at least one valve element rotatably and / or displaceably mounted in the valve body such that the channels are optional can be connected to one another, at least one channel being connected to an electrical pressure sensor which controls at least one valve element via an electronic controller and an adjusting element such that the pressure in the corresponding channel always corresponds to a predetermined desired value.
  • a pressure control valve in particular an electro-pneumatic 3/2-way pressure control valve, consisting of a valve body with at least two input or output channels and at least one valve element rotatably and / or displaceably mounted in the valve body such that the channels are optional can be connected to one another, at least one channel being connected to an electrical pressure sensor which controls at least one valve element via an electronic controller and an adjusting element such that the pressure in the corresponding channel always corresponds to a predetermined desired value.
  • Pressure control valves of this type are used for the electrical setting of pressures which are controlled as a function of an electrical setpoint.
  • the actual value of an output pressure is converted by the pressure sensor into an electrical variable proportional to the pressure (eg current, voltage) and compared with an electrical input signal, ie with the setpoint.
  • the electronic controller controls an electrical variable that the difference between these values is proportional and corresponds to the direction of the deviation.
  • the electronic controller controls an adjusting element, usually a solenoid valve, via a downstream power electronics.
  • the pressure sensors are arranged in the external pressure lines.
  • the electronic circuits are also arranged externally, the known pressure control valves require a lot of installation space, so that they no longer meet today's requirements with regard to compact, small sizes.
  • the present invention is therefore based on the object of specifying a pressure control valve of the type described at the outset, which is small and compact.
  • valve body has at least one additional measuring channel which opens into the corresponding channel and is open to the outside and into which a plug can be inserted sealingly, the pressure sensor with associated measuring electronics and connections for connecting lines being inserted in the plug is integrated to the actuator.
  • This advantageous embodiment creates a particularly compact pressure control valve, the pressure sensor and the measuring electronics advantageously also being protected against mechanical and other external influences within of the plug are arranged. It is therefore also possible to use particularly sensitive electronic components which are distinguished by their particularly small size. Further advantageous design features of the invention are contained in the subclaims.
  • the single figure shows a schematic, partially sectioned illustration of a pressure control valve according to the invention.
  • an electro-pneumatic 3/2-way pressure control valve 1 which consists of a valve body 2, one with a pressure generator, for. B. a pneumatic pump connectable input channel P, a connectable to a pressure medium return channel R and an output channel A connectable to a consumer.
  • the open-edge channels P, R, A expediently each have an internal thread 3, at least on their opening side, for the connection of pipes or hose lines, not shown.
  • a valve element 4 is displaceably arranged between two switching positions in the direction of the double arrow 5 such that the channels P and A are connected to one another in a first switching position and the channels R and A are connected to one another in the second switching position shown.
  • the corresponding connections are only shown schematically in the drawing using lines.
  • the valve element 4 is moved by means of an adjusting member 6, which is usually an electromagnet M.
  • the invention can also be applied to those pressure control valves which have several, for. B. have two, mutually rotatable and / or displaceable valve elements in the valve body 2 such that the channels are selectively interconnectable. It can also be a hydraulic valve.
  • the valve body 2 now has at least one additional measuring channel 11 which opens into the corresponding channel A, P, R and is open to the outside.
  • the measuring channel 11 opens into the output channel A, but can also open into the input channel P or the return channel R.
  • a plug 12 can be inserted sealingly, for. B. screwed, which is advantageously sealed via a soft seal against the measuring channel 11.
  • the stopper 12 contains a pressure sensor 13 with associated measuring electronics 14 and optionally a measuring amplifier 15 and connections for connecting lines 16 to the adjusting element 6.
  • the pressure sensor 13 converts the pressure P prevailing in the measuring channel 11 and thus also in the channel A into a pressure proportional to this electrical quantity, in the example shown current I um.
  • a laser sensor, a piezosensitive sensor or a strain gauge is particularly suitable as the pressure sensor 13.
  • the pressure control valve 1 according to the invention is distinguished by its compact shape and its small size, the sensitive electronic components advantageously being arranged inside the stopper 12 in a manner protected against external mechanical influences.

Abstract

The invention relates to a pressure-regulating valve, in particular an electropneumatic 3/2-way pressure-regulating valve, comprising a valve body (2) with at least two inlet and outlet channels (A, P, R) and at least one valve element (4), which is rotatably and/or displaceably mounted in the valve body (2) in such a way that the channels can be connected to one another as desired, at least one channel being connected to an electric pressure sensor (13) which, via an electronic controller and an adjusting member (6), controls at least one valve element (4) in such a way that the pressure in the corresponding channel always corresponds to a predetermined setpoint, the valve body (2) having at least one additional measurement channel (11), which opens into the corresponding channel (A, P, R), is open towards the outside at the edge and into which a plug (12) can be sealingly inserted from outside, and the pressure sensor (13) with the associated measurement electronics (14) and connections for connecting leads (16) to the adjusting member (6) being integrated into the plug (12). <IMAGE>

Description

Die Erfindung betrifft ein Druckregelventil, insbesondere ein elektro-pneumatisches 3/2-Wege-Druckregelventil, bestehend aus einem Ventilkörper mit mindestens zwei Eingangs- bzw. Ausgangskanälen sowie mindestens einem in dem Ventilkörper derart verdrehbar und/oder verschiebbar gelagerten Ventilelement, daß die Kanäle wahlweise untereinander verbindbar sind, wobei zumindest ein Kanal mit einem elektrischen Drucksensor verbunden ist, der über einen elektronischen Regler und ein Verstellglied mindestens ein Ventilelement derart ansteuert, daß der Druck in dem entsprechenden Kanal stets mit einem vorgegebenen Sollwert übereinstimmt.The invention relates to a pressure control valve, in particular an electro-pneumatic 3/2-way pressure control valve, consisting of a valve body with at least two input or output channels and at least one valve element rotatably and / or displaceably mounted in the valve body such that the channels are optional can be connected to one another, at least one channel being connected to an electrical pressure sensor which controls at least one valve element via an electronic controller and an adjusting element such that the pressure in the corresponding channel always corresponds to a predetermined desired value.

Derartige Druckregelventile dienen zur elektrischen Einstellung von Drücken, die abhängig von einem elektrischen Sollwert angesteuert werden. Hierzu wird der Istwert eines Ausgangsdruckes mittels des Drucksensors in eine dem Druck proportionale elektrische Größe (z. B. Strom, Spannung) umgeformt und mit einem elektrischen Eingangssignal, d. h. mit dem Sollwert, verglichen. Der elektronische Regler steuert eine elektrische Größe aus, die der Differenz dieser Werte proportional ist und der Richtung der Abweichung entspricht. Über eine nachgeschaltete Leistungselektronik steuert der elektronische Regler ein Verstellglied, zumeist ein Magnetventil, an. Dadurch wird der Istwert des Druckes und gleichzeitig der elektrische Istwert proportional verändert. Die Druckänderung wird beendet, wenn der elektrische Istwert dem vorgegebenen Sollwert entspricht.Pressure control valves of this type are used for the electrical setting of pressures which are controlled as a function of an electrical setpoint. For this purpose, the actual value of an output pressure is converted by the pressure sensor into an electrical variable proportional to the pressure (eg current, voltage) and compared with an electrical input signal, ie with the setpoint. The electronic controller controls an electrical variable that the difference between these values is proportional and corresponds to the direction of the deviation. The electronic controller controls an adjusting element, usually a solenoid valve, via a downstream power electronics. As a result, the actual value of the pressure and, at the same time, the electrical actual value are changed proportionally. The pressure change is ended when the actual electrical value corresponds to the specified setpoint.

Bei den bekannten Druckregelventilen ist jedoch von Nachteil, daß die Drucksensoren in den externen Druckleitungen angeordnet sind. Da darüber hinaus auch die elektronischen Schaltungen extern angeordnet sind, benötigen die bekannten Druckregelventile viel Einbauraum, so daß sie den heutigen Anforderungen hinsichtlich kompakten, kleinen Baugrößen nicht mehr gerecht werden.In the known pressure control valves, however, it is disadvantageous that the pressure sensors are arranged in the external pressure lines. In addition, since the electronic circuits are also arranged externally, the known pressure control valves require a lot of installation space, so that they no longer meet today's requirements with regard to compact, small sizes.

Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, ein Druckregelventil der eingangs beschriebenen Art anzugeben, das klein und kompakt ausgebildet ist.The present invention is therefore based on the object of specifying a pressure control valve of the type described at the outset, which is small and compact.

Erfindungsgemäß wird dies dadurch erreicht, daß der Ventilkörper mindestens einen zusätzlichen, in den entsprechenden Kanal mündenden, nach außen randoffenen Meß= kanal aufweist, in den von außen ein Stopfen dichtend einsetzbar ist, wobei in den Stopfen der Drucksensor mit zugehöriger Meßelektronik sowie Anschlüssen für Verbindungsleitungen zu dem Verstellglied integriert ist. Diese vorteilhafte Ausgestaltung schafft ein besonders kompaktes Druckregelventil, wobei der Drucksensor und die Meßelektronik vorteilhafterweise auch gegen mechanische und sonstige äußere Einflüsse geschützt innerhalb des Stopfens angeordnet sind. Es können daher auch besonders empfindliche, elektronische Bauteile verwendet werden, die sich durch besonders geringe Baugröße auszeichnen. Weitere vorteilhafte Ausgestaltungsmerkmale der Erfindung sind in den Unteransprüchen enthalten.According to the invention, this is achieved in that the valve body has at least one additional measuring channel which opens into the corresponding channel and is open to the outside and into which a plug can be inserted sealingly, the pressure sensor with associated measuring electronics and connections for connecting lines being inserted in the plug is integrated to the actuator. This advantageous embodiment creates a particularly compact pressure control valve, the pressure sensor and the measuring electronics advantageously also being protected against mechanical and other external influences within of the plug are arranged. It is therefore also possible to use particularly sensitive electronic components which are distinguished by their particularly small size. Further advantageous design features of the invention are contained in the subclaims.

Anhand der Zeichnung soll im folgenden die Erfindung beispielhaft näher erläutert werden.The invention will be explained in more detail below by way of example with reference to the drawing.

Die einzige Figur zeigt eine schematische, teilgeschnittene Darstellung eines erfindungsgemäßen Druckregelventils.The single figure shows a schematic, partially sectioned illustration of a pressure control valve according to the invention.

In der Zeichnung ist ein elektro-pneumatisches 3/2-Wege-Druckregelventil 1 dargestellt, daß aus einem Ventilkörper 2 besteht, der einen mit einem Druckerzeuger, z. B. einer Pneumatikpumpe verbindbaren Eingangskanal P, einen mit einem Druckmitteltank verbindbaren Rückführkanal R sowie einen mit einem Verbraucher verbindbaren Ausgangskanal A aufweist. Die randoffenen Kanäle P, R, A weisen zweckmäßigerweise zumindest auf ihrer Öffnungsseite jeweils ein Innengewinde 3 zum Anschluß von nichtdargestellten Rohr- oder Schlauchleitungen auf. Innerhalb des Ventilkörpers 2 ist im dargestellten Beispiel ein Ventilelement 4 in Richtung des Doppelpfeils 5 derart zwischen zwei Schaltstellungen verschiebbar angeordnet, daß in einer ersten Schaltstellung die Kanäle P und A und in der dargestellten zweiten Schaltstellung die Kanäle R und A miteinander verbunden sind. Die entsprechenden Verbindungen sind in der Zeichnung lediglich schematisch anhand von Linien dargestellt. Das Ventilelement 4 wird mittels eines Verstellgliedes 6, das in der Regel ein Elektromagnet M ist, bewegt.In the drawing, an electro-pneumatic 3/2-way pressure control valve 1 is shown, which consists of a valve body 2, one with a pressure generator, for. B. a pneumatic pump connectable input channel P, a connectable to a pressure medium return channel R and an output channel A connectable to a consumer. The open-edge channels P, R, A expediently each have an internal thread 3, at least on their opening side, for the connection of pipes or hose lines, not shown. Within the valve body 2, in the example shown, a valve element 4 is displaceably arranged between two switching positions in the direction of the double arrow 5 such that the channels P and A are connected to one another in a first switching position and the channels R and A are connected to one another in the second switching position shown. The corresponding connections are only shown schematically in the drawing using lines. The valve element 4 is moved by means of an adjusting member 6, which is usually an electromagnet M.

Neben der dargestellten Ausführung kann die Erfindung auch bei solchen Druckregelventilen angewendet werden, die mehrere, z. B. zwei, gegeneinander verdreh- und/oder verschiebbare Ventilelemente in dem Ventilkörper 2 derart aufweisen, daß die Kanäle wahlweise untereinander verbindbar sind. Dabei kann es sich auch um ein hydraulisches Ventil handeln.In addition to the embodiment shown, the invention can also be applied to those pressure control valves which have several, for. B. have two, mutually rotatable and / or displaceable valve elements in the valve body 2 such that the channels are selectively interconnectable. It can also be a hydraulic valve.

Erfindungsgemäß weist nun der Ventilkörper 2 mindestens einen zusätzlichen, in den entsprechenden Kanal A, P, R mündenden, nach außen randoffenen Meßkanal 11 auf. Im dargestellten Ausführungsbeispiel der Erfindung mündet der Meßkanal 11 in dem Ausgangskanal A, kann jedoch auch in den Eingangskanal P oder den Rückführkanal R münden. In den Meßkanal 11 ist von außen ein Stopfen 12 dichtend einsetzbar, z. B. einschraubbar, der vorteilhafterweise über eine Weichdichtung gegen den Meßkanal 11 abgedichtet ist. Der Stopfen 12 enthält erfindungsgemäß einen Drucksensor 13 mit zugehöriger Meßelektronik 14 und gegebenenfalls einen Meßverstärker 15 sowie Anschlüsse für Verbindungsleitungen 16 zu dem Verstellglied 6. Der Drucksensor 13 wandelt den in dem Meßkanal 11 und damit auch in dem Kanal A herrschenden Druck P in eine hierzu proportionale elektrische Größe, im dargestellten Beispiel Strom I um. Die Meßelektronik 14, in die zuvor ein Sollwert eingegeben wurde (was der Pfeil 17 andeuten soll), vergleicht den von dem Drucksensor 13 ermittelten Istwert mit dem Sollwert. Anhand der Differenz beider Werte wird eine zu der Differenz proportionale elektrische Größe ausgesteuert und über den Meßverstärker 15 und die Verbindungsleitungen 16 dem Verstellglied 6 zugeführt, welches eine entsprechende Verstellung des Ventilelementes 4 bewirkt, bis der Istwert mit dem Sollwert übereinstimmt. Auf diese Weise wird der Druck P in dem Meßkanal und folglich auch in dem mit diesem verbundenen Kanal (hier A) stets konstant gehalten.According to the invention, the valve body 2 now has at least one additional measuring channel 11 which opens into the corresponding channel A, P, R and is open to the outside. In the illustrated embodiment of the invention, the measuring channel 11 opens into the output channel A, but can also open into the input channel P or the return channel R. In the measuring channel 11, a plug 12 can be inserted sealingly, for. B. screwed, which is advantageously sealed via a soft seal against the measuring channel 11. According to the invention, the stopper 12 contains a pressure sensor 13 with associated measuring electronics 14 and optionally a measuring amplifier 15 and connections for connecting lines 16 to the adjusting element 6. The pressure sensor 13 converts the pressure P prevailing in the measuring channel 11 and thus also in the channel A into a pressure proportional to this electrical quantity, in the example shown current I um. The measuring electronics 14, into which a target value was previously entered (which is indicated by the arrow 17), compares the actual value determined by the pressure sensor 13 with the target value. Based on the difference between the two values, an electrical variable proportional to the difference is modulated and fed via the measuring amplifier 15 and the connecting lines 16 to the adjusting element 6, which effects a corresponding adjustment of the valve element 4 until the actual value coincides with the desired value. To this In this way, the pressure P in the measuring channel and consequently also in the channel connected to it (here A) is always kept constant.

Aufgrund seiner geringen Größe eignet sich als Drucksensor 13 insbesondere ein Laser-Sensor, ein piezosensitiver Sensor oder ein vorzugsweise in Dünnfilmtechnik hergestellter Dehnmeßstreifen.Because of its small size, a laser sensor, a piezosensitive sensor or a strain gauge, preferably manufactured using thin film technology, is particularly suitable as the pressure sensor 13.

Das erfindungsgemäße Druckregelventil 1 zeichnet sich durch seine kompakte Form und seine geringe Größe aus, wobei vorteilhafterweise die empfindlichen, elektronischen Bauteile gegen äußere, mechanische Einflüsse geschützt innerhalb des Stopfens 12 angeordnet sind.The pressure control valve 1 according to the invention is distinguished by its compact shape and its small size, the sensitive electronic components advantageously being arranged inside the stopper 12 in a manner protected against external mechanical influences.

Claims (7)

1. Druckregelventil, insbesondere elektro-pneumatisches 3/2-Wege-Druckregelventil, bestehend aus einem Ventilkörper mit mindestens zwei Eingangs- bzw. Ausgangskanälen sowie mindestens einem in dem Ventilkörper derart verdrehbar und/oder verschiebbar gelagerten Ventilelement, daß die Kanäle wahlweise untereinander verbindbar sind, wobei zumindest ein Kanal mit einem elekrischen Drucksensor verbunden ist, der über einen elektronischen Regler und ein Verstellglied mindestens ein Ventilelement derart ansteuert, daß der Druck in dem entsprechenden Kanal stets mit einem'vorgegebenen Sollwert übereinstimmt, dadurch gekennzeichnet, daβ der Ventilkörper (2) mindestens einen zusätzlichen, in den entsprechenden Kanal (A, P, R) mündenden, nach außen randoffenen Meßkanal (11) aufweist, in den von außen ein Stopfen (12) dichtend einsetzbar ist, wobei in den Stopfen (12) der Drucksensor (13) mit zugehöriger Meßelektronik (14) sowie Anschlüssen für Verbindungsleitungen (16) zu dem Verstellglied (6) integriert ist.1. Pressure control valve, in particular electro-pneumatic 3/2-way pressure control valve, consisting of a valve body with at least two input or output channels and at least one valve element rotatably and / or displaceably mounted in the valve body in such a way that the channels can optionally be connected to one another , wherein at least one channel is connected to an electrical pressure sensor, which controls at least one valve element via an electronic controller and an adjusting element such that the pressure in the corresponding channel always corresponds to a predetermined setpoint, characterized in that the valve body (2) has at least one additional measuring channel (11) which opens into the corresponding channel (A, P, R) and into which a plug (12) can be inserted sealingly from the outside, the pressure sensor (13 ) with associated measuring electronics (14) and connections for connecting lines (16) to the adjusting element (6) in is tegrated. 2. Druckregelventil nach Anspruch 1, dadurch gekennzeichnet, daß der Stopfen (12) über eine Weichdichtung gegen den Meßkanal (11) abgedichtet ist.2. Pressure control valve according to claim 1, characterized in that the stopper (12) is sealed via a soft seal against the measuring channel (11). 3. Druckregelventil nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Drucksensor (13) ein Laser-Sensor ist.3. Pressure control valve according to claim 1 or 2, characterized in that the pressure sensor (13) is a laser sensor. 4. Druckregelventil nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Drucksensor (13) ein piezosensitiver Sensor ist.4. Pressure control valve according to claim 1 or 2, characterized in that the pressure sensor (13) is a piezosensitive sensor. 5. Druckregelventil nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Drucksensor (13) ein vorzugsweise in Dünnfilmtechnik hergestellter Dehnmeßstreifen ist.5. Pressure control valve according to claim 1 or 2, characterized in that the pressure sensor (13) is a preferably made in thin film strain gauge. 6. Druckregelventil nach einem oder mehreren der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Meßkanal (11) in den mit einem Verbraucher verbundenen Ausgangskanal .(A) mündet.6. Pressure control valve according to one or more of claims 1 to 5, characterized in that the measuring channel (11) opens into the output channel (A) connected to a consumer. 7. Druckregelventil nach einem oder mehreren der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Meßkanal (11) in den mit einem Druckerzeuger verbundenen Eingangskanal (P) . mündet.7. Pressure control valve according to one or more of claims 1 to 5, characterized in that the measuring channel (11) in the input channel (P) connected to a pressure generator. flows.
EP87107989A 1986-06-13 1987-06-03 Pressure-regulating valve Expired - Lifetime EP0249797B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863619991 DE3619991A1 (en) 1986-06-13 1986-06-13 PRESSURE CONTROL VALVE
DE3619991 1986-06-13

Publications (3)

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EP0249797A2 true EP0249797A2 (en) 1987-12-23
EP0249797A3 EP0249797A3 (en) 1989-09-13
EP0249797B1 EP0249797B1 (en) 1994-03-09

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EP87107989A Expired - Lifetime EP0249797B1 (en) 1986-06-13 1987-06-03 Pressure-regulating valve

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DE (2) DE3619991A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4232586A1 (en) * 1992-09-23 1994-03-24 Mannesmann Ag Switching valve with regulation of output pressure - has inlet valve stage that closes when output pressure exceeds reference with vent valve stage opening to control pressure
US9982746B2 (en) 2014-08-01 2018-05-29 Dayco Ip Holdings, Llc Two-part hub for a torsional vibration damper and method of making same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19643788A1 (en) * 1996-10-30 1998-05-07 Voith Turbo Kg Electrohydraulic pressure control device and method for converting electrical control signals into hydraulic control pressure

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2450368A1 (en) * 1979-03-01 1980-09-26 Renault Pressure servo control for machine tools - has electrically controlled pressure limiter providing steady pressure set between extreme supply levels
DE8520484U1 (en) * 1985-07-16 1985-08-22 Forschungsgesellschaft Heizung-Lüftung-Klimatechnik Stuttgart mbH, 7000 Stuttgart Temperature measuring head

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3136174A1 (en) * 1981-09-12 1983-03-31 Mannesmann Rexroth GmbH, 8770 Lohr "PRESSURE CONTROL VALVE"

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2450368A1 (en) * 1979-03-01 1980-09-26 Renault Pressure servo control for machine tools - has electrically controlled pressure limiter providing steady pressure set between extreme supply levels
DE8520484U1 (en) * 1985-07-16 1985-08-22 Forschungsgesellschaft Heizung-Lüftung-Klimatechnik Stuttgart mbH, 7000 Stuttgart Temperature measuring head

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ENERGIE FLUIDE, Band 24, Nr. 9, Dezember 1985, Seiten 4-6, Paris, FR; "Régulateurs de pression électropneumatiques à commande électronique intégrée" *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4232586A1 (en) * 1992-09-23 1994-03-24 Mannesmann Ag Switching valve with regulation of output pressure - has inlet valve stage that closes when output pressure exceeds reference with vent valve stage opening to control pressure
US9982746B2 (en) 2014-08-01 2018-05-29 Dayco Ip Holdings, Llc Two-part hub for a torsional vibration damper and method of making same

Also Published As

Publication number Publication date
DE3789256D1 (en) 1994-04-14
EP0249797B1 (en) 1994-03-09
EP0249797A3 (en) 1989-09-13
DE3619991A1 (en) 1987-12-17

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